Soldato
it is only if you want it to be, you obviously want to paint it as the detriment of Toyota, but the fact is they do lots in house, take Toyota motosport gmbh, why do several f1 teams use this facility? its because its hugely respected and several company's look to them for assistance.
not all parts for engines are made by the manufacturer that sticks its badge on the car. nothing new.
nothing new about someone trying to paint a picture of a manufacturer in a negative light because of some stupid argument and an incredibly simplistic point of view just like you have.
I actually made my other comment in jest, I'm a big fan of Toyota's.